Incremental Measuring Method！

With the incremental measuring
method, the graduation consists of a
periodic grating structure. The position
information is obtained by counting the
individual increments (measuring steps)
from some point of origin. Since an
absolute reference is required to ascertain
positions, the scales or scale tapes are
provided with an additional track that bears
a reference mark. The absolute position on
the scale, established by the reference
mark, is gated with exactly one measuring
step. The reference mark must therefore
be scanned to establish an absolute
reference or to fi nd the last selected
datum

In some cases this may necessitate
machine movement over large lengths of
the measuring range. To speed and simplify
such „reference runs,“ many encoders
feature distance-coded reference
marks—multiple reference marks that are
individually spaced according to a
mathematical algorithm. The subsequent
electronics fi nd the absolute reference
after traversing two successive reference
marks—only a few millimeters traverse
(see table).
Encoders with distance-coded reference
marks are identifi ed with a ”C“ after the
model designation (e.g. LS 487C).

incremental encoder,absolute encoder

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